Write the rational expression in lowest terms.
A. x + 4
B. x - 4
C. x + 16
D. x - 16
Answer: B
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Solve the problem.A variable resistor R and an 8-? resistor in parallel have a combined resistance RT given by 
If R is changing at 
find the rate at which RT is changing when 
A. 0.30 ?/min B. 0.018 ?/min C. 1.7 ?/min D. 0.15 ?/min
Solve the problem.During a department store sale, 30 shoppers bought only clothing, 5 shoppers bought only towels, and 15 shoppers bought both clothing and towels. If 100 people shopped that day and a shopper is chosen at random, what is the probability that the shopper has bought towels?
A. 
B. 
C. 
D. 
Find the standard-form equation for an ellipse which satisfies the given conditions.An ellipse with y-intercepts ±6; foci at 
and 
.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Evaluate the algebraic expression for the given values of the variables.x - (y + z) for x = 20, y = 10, and z = 5
A. 35 B. 5 C. 15 D. 16